基于有限元分析的S195柴油机活塞改进设计.doc

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1、基于有限元方法的S195柴油机活塞设计[摘要]本文针对将S195型柴油机的涡流室燃烧室改为直喷式燃烧室,对活塞的结构进行了改进设计。对改进后的发动机进行了热力计算和动力计算，将计算所求得的最高爆发压力和对应的加速度所产生的惯性力作为活塞最危险工作情况，利用有限元分析软件ANSYS对其进行机械应力分析，得出活塞应力云图和变形云图，根据分析结果，活塞的最大应力和最大位移并没有超出允许围,本设计满足了改进后发动机的实际工况。[关键词]活塞；ANSYS；燃机TheDesignofPistoninS195DieselEngineBasedonFiniteElementMetho

2、dAbstractTosatifythenewconditionofswirlchamberbeingchangedintodirectinjectioncombustionchamberandimprovethefueleconomy,thestructureofpistoninS195DieselEnginewasredesigned.Thethermodynamicandpowercalculationweredone.Thecombustionchanberandpistonringetcwerechangedtoadjusttothedirectinject

3、iondieselengine.Themaximumoutbreakpressureobtainedbycalculationandtheinertialforcegeneratedbythecorrespondingpistonaccelerationwererecognizedasthemostdangerousworkingconditions,usingANSYSfiniteelementanalysissoftwareformechanicalstressanalysis,thepistonstressanddeformationcloudwereobtai

4、ned.Accordingtotheresultoftheanalysis,themaximumstressandmaximumdisplacementofthepistondoesnotexceedthepermissiblerange,thedesigncanmeettheactualengineoperatingconditions.KeywordsPiston;ANSYS;InternalCombustionEngine.目录引言................................................................11

5、.直喷式S195柴油机热力计算和动力计算...............................11.1热力计算........................................................21.1.1原始参数及己知条件............................................21.1.2选定参数......................................................31.1.3气缸工作过程计算...................................

6、...........31.1.4示功图绘制...................................................61.2动力计算........................................................82．活塞主要尺寸设计及强度计算......................................112.1活塞的工作条件、材料以及设计要求................................112.2主要尺寸设计................................

7、...................122.2.1燃烧室尺寸...................................................122.2.2顶岸高度.....................................................132.2.3活塞环.......................................................142.2.4活塞顶厚度...................................................152.